Tool for removing engine-valves.



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TOOL FOR REMOVING ENGINE-VALVES.

Specification of Letters Patent.

Patented May 16, 1916.

Application filed October 30, 1915. Serial IiTo. 58,802.

To all whom it may concern L' Be it known that I, CHARLES M. VVILKER- son, a citizen of the United States, and a resident of Middlefield, in the county of Geauga and State of Ohio, have invented a new and Improved Tool for Removing Engine-Valves, of which the following is a full, clear, and exact description.

My invention relates to tools for use in removing the valves of internal combustion engines, usually termed a valve-lifter.

My invention provides lever arms arranged to be given a separating movement by a cam lever whereby to compress the valve spring and relieve the usual cotter pin of spring pressure so that the pin may be readily removed. The arrangement of the cam lever relative to one of the lever arms is such that said lever arm will be rocked to compress the spring and will then be locked to maintain the spring under com pression.

The invention will be particularly explained in the specific description following.

Reference is to be had to the accompanying drawings forming part of this specification in which similar reference characters indicate corresponding parts in all the views.

Figure 1 is a side elevation of a valve tool embodying my invention showing the same in use and positioned for the compression of the valve spring; Fig. 2 is a similar view of my improved tool partly in section and showing the parts of the tool in position after the spring is compressed; and Fig. 3 is a plan view of the improved tool.

In the drawing I have illustrated a fragment of a known type of an internal combustion engine A together with a valve B, the stem C of which has a compression spring D thereon abutting at its upper end against a washer E, having a bearing on the cylinder, the lower end of the spring being seated on a slidable collar or washer F, which is sustained by the cotter pin G. The valve stem rests at its lower end, in this type of engine, on an adjusted nut H on the valve operating element I, which is actuated in a known manner.

My improved tool comprises a handle 10, and at the front of the tool and preferably integral with the handle'is a lever arm 11, forked at its forward end as at 11 to receive the valve stem C and rest on a nut H. or equivalent bearing member. A second C. In order that the throw of the lever arm 12 may be adjusted, a pin 14, has its ends movable in vertical slots 15, in the cheeks 13. A set screw 16, extends upwardly between the cheeks 13, and beneath the lever arm 12, constituting a fulcrum for said lever so that the fulcrum point may be raised or lowered to vary the possible throw of the shorter arm 12*, of the said lever arm.

The lever arm 12, is actuated to give relative movement to the arms 11, 12, by means of a cam lever 17, which is fulcrumed by a pin 18, or the like, passing through the cheeks 13, and is formed with a cam head 19, adapted to bear against the short arm 12*, of the lever arm 12. The arrangement of the cam lever 17 is such that it may be brought to a position ranging alongside of the handle 10,to be grasped jointly with the latter or swung to a raised position, the said positions being indicated respectively in Figs. 2 and 1.

With the described construction when the tool is to be used to compress the spring D, the cam lever 17, is raised as shown in Fig. 1, thereby permitting the lever arms 11 and 12, to lie in close relation permitting them to be disposed between the washer F, and the nut H, or equivalent hearing. The lever 17, is now swung downwardly to bring its head 19, against the short arm 12 of the lever arm 12, thereby rocking the latter downwardly and compressing the spring as shown in Fig. 2. In the lowered position of the cam lever 17, its bearing point or nose, will move across a vertical line passing through the pin 18 so that the cam lever and the lever arm 12, are locked against retrograde movement by the pressure of the spring D. Thus, the tool is self-locking to hold the spring D under compression, thereby permitting of the cotter pin Gr being conveniently removed. With the spring compressed, the valve stem thereof is relieved of pressure and after the removal of the cotter pin, the valve may be readily lifted.

It will be observed that the tool requires no element clamping against the top of the valve while the spring is being compressed.

Having thus described my invention I claim as new, and desire to secure by Letters Patent:

A valve tool including a handle, having rigid therewith a forwardly extending lever arm, members extending from the tool at the juncture of the handle and lever arm, a second lever arm disposed between said members and having a slot and pin connection with the latter, a set screw in the tool adjacent to the juncture of the handle and the rigid lever arm and forming a fulcrum for the rockable lever arm, and a cam lever having engagement with the rockable lever arm to actuate the lever. V

In testimony whereof I have signed my 15 name to this specification in the presence of two subscribing witnesses.

CHARLES M. WILKERSON. Witnesses: w

A. G. A'rwoon, JAs. S. Monnow.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

